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Originally posted by andrew boyce It is all about the gass released when the stuff melts or burns.

PVC is will release toxic gasses that will cause you to die before you can get away from the fire..

AB

Most everything in your house andrew boyce released gass when it burn.Plummers use it to in house.

This is pvc duct

First time I've ever seen this type of PVC duct. Can it come in any rectangular size? I assume this is designed for underground slabs? Besides being used underground, what other applications would it be used in? That would have to be expensive. It's not like you can fab this in the shop.

True.. but in the infinite wisdom of the US government they have decided to rate some types of materials more of a risk when burning or melting than others... this is the reason that the PVC ducts you have in those pictures are most likely designed with low levels of this gas...

I feel that if one attempts to breath anything that is burning you will likely die. so whats the point. Best thing to do is get out of a burning house or structure as this in it self is likely to result in death.. LOL

they do make pvc-coated sheets of iron. it can be run through fab machines like regular galvanized and formed into regular rectangular pipe and fittings. i'm sure it ain't cheap. we used it in some medical building, i don't recall exactly, it was quite a few years ago. i do remember that the finished product seemed to have alot of the coating worn off after running it through the machines. ANYTHING is possible if you have the money.

Originally posted by andrew boyce True.. but in the infinite wisdom of the US government they have decided to rate some types of materials more of a risk when burning or melting than others... this is the reason that the PVC ducts you have in those pictures are most likely designed with low levels of this gas...

I feel that if one attempts to breath anything that is burning you will likely die. so whats the point. Best thing to do is get out of a burning house or structure as this in it self is likely to result in death.. LOL

:-)

AB

andrew boyce what do you do for a living because some of you information is way off or I am just reading it wrong?

Thanks !

Thanks for answering my question people. I was just curious now I know. God for bid the ductwork catches on fire. I agree if one gets out with out choking from the foams, carpets,plastics ect. in a home. Makes a fire rating on ductwork a mute point if you ask me.